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I bought my truck to pull my boat, the boat is about 15k loaded with the trailer. I just pulled it out of the water for winter storage and drug it 170miles back to town. up and down and through the mountains. this was my first time towing this boat with this truck, I didnt push it, kept the rpms between 2k - 2700 as much as I could ran between 7000 ft elevation to 4000 ft the truck ran well, pulled the boat without too much of a problem, tow/haul mode was wonderful, slowest I went on any uphill grade was 40 and that was mainly because I didnt want to run 3k+ on the rpms.
glad I bought this psd, no problems, no funny noises, nothing went wrong...if you dont have one of these trucks...get one...have a great week!!
for all you mpg guys I averaged 7mpg but I was towing 15k in the mountains...no complaints.